I also noticed in your trace that there is no "Trying" received from cucm before the "session progress".....

When CUBE sent an invite to cucm, the first response should be "trying" Thats how cucm says i am going to look for the number....Are you sending the full trace? If you are then something is wrong with the way CUCM is processing the sip invite

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"'Nature is too thin a screen, the glory of the omnipresent God bursts through it everywhere"-Ralph Waldo Emerson